La densidad del gas amoniaco a cierta temperatura y presión es 3.5g/L. ¿Cuál será la densidad de la fosfina PH3 gaseosa en las mismas condiciones de presión y temperatura.

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It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).